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Feeds
Solving 2 PDEs across one domain.
This documentation page shows how to specify an f-coefficient on a specific domain: <http://www.mathworks.com/help/pde/ug/sca...
10 years 前 | 0
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Simulation of coupled partial differential equation using MATLAB.
I took a look at your attachment and think I understand most, but not all, of the problem you are trying to solve (I don't under...
10 years 前 | 0
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Problems with LDL factorization
Have you tried solving the over-determined system directly: x = A\b; Computing using the normal equations, A'*A, is almost...
10 years 前 | 0
Can I use Poisson equation or any equation with desired parameters in PDE Toolbox using Rectangular shape?
Take a look at this example: <http://www.mathworks.com/help/pde/ug/electrostatics.html> Bill
10 years 前 | 0
Why aren't the essential boundary conditions fulfilled?
I ran this example in R2014a of MATLAB and I do get -1 at the lower left corner (and upper right) I created the example in pd...
10 years 前 | 0
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Solve parabolic coupled PDE's using MATLAB's pdepe solver?
Yes, pdepe can definitely solve systems of pde. In general, the u argument to the functions you define has as many rows as ther...
10 years 前 | 0
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structured quadrilateral mesh in PDE Toolbox
There is no support for quadrilateral elements in PDE Toolbox-- either in the meshers or the computational modules. However, if...
10 years 前 | 0
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How to define a temperature dependent parameters in a PDE Toolbox?
Yes, PDE Toolbox allows the coefficients to be functions of the dependent variables (e.g. temperature). This documentation page ...
10 years 前 | 2
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Setting up the initial conditions for BVP4C?
From your call to bvpinit where you have this [0.01; 0.9] for the initial guess, it looks like you have 2 differential equation...
10 years 前 | 1
Matlab hyperbolic PDE equation errors
There are several ways to define PDE Toolbox coefficients that vary spatially. But, defining the value of the coefficient at eve...
10 years 前 | 1
How to solve system of three nonlinear PDE?
pdenonlin is for solving only PDE that are not a function of time. However, the parabolic function can solve equations that a...
10 years 前 | 0
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Solve a non linear differential equation systems with only boundary conditions
You have a system of two first order differential equations so you need just two boundary conditions. I would guess that specify...
10 years 前 | 0
Reg. PDEPE 's internal discretization of time
pdepe uses the variable time step ODE solver, ode15s, internally. http://www.mathworks.com/help/matlab/ref/ode15s.html The...
10 years 前 | 1
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Insert f coefficient in pdetool
Do you calculate F in fcoeff? If so, you can make it a global variable and it will retain its value between calls to fcoeff. ...
10 years 前 | 0
pdepe daeic12 (line 77) eror
I don't see any boundary conditions on c3. I think this may be the cause of your problem. Bill
10 years 前 | 0
Error solving simultaneous PDEs.
The first thing I should say is that pdepe is designed to solve systems of parabolic and elliptic PDEs. Practically this means t...
10 years 前 | 0
create sparse matrix from diagonal arrays
This doesn't exactly answer your question but still may be useful. This example: http://math.mit.edu/cse/codes/mit18086_poiss...
10 years 前 | 0
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How to implement irregular, time-dependent boundary condition in PDEPE function?
I think that pr = interp1(timedata, tempdata, t) - ur; may be what you need. Assuming the lengths of timedata and temp...
10 years 前 | 1
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How can I solve a PDE with given coefficients in time?
Take a look at this example: <http://www.mathworks.com/help/pde/ug/nonlinear-heat-transfer-in-a-thin-plate.html Nonlinear Hea...
10 years 前 | 0
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Function of boundary conditions PDEPE
To set the temperature at each end to fittedmodel(t), you would define: pl = ul-fittedmodel(t); pr = ur-fittedmodel(t); ...
10 years 前 | 0
calculate the capacitance with PDE toolbox
One of the simplest ways to calculate capacitance using PDE Toolbox is from the energy: C = 2*U/V^2 where U is the electrostatic...
10 years 前 | 1
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How to control times at which PDE Toolbox solves a parabolic equation?
I'm afraid I wasn't able to run your example. I believe that your fcoeff function has an error in it. I did take a look at th...
10 years 前 | 0
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Calculation of Jacobian for ode15s in hyperbolic/parabolic-Solver?
If the Jacobian is a function of the dependent variables (or time), ode15s will typically call pdehypdf many times during a com...
10 years 前 | 0
Calculation of Jacobian for ode15s in hyperbolic/parabolic-Solver?
Hi Lena, Yes, you are correct that the Jacobian calculated in parabolic/hyperbolic is only approximate. However, in my experi...
10 years 前 | 0
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How to control times at which PDE Toolbox solves a parabolic equation?
>This does not yield correct results at the time values I ask it to plot the results So, why don't you request results at the...
11 years 前 | 0
eigs - Error with ARPACK routine znaupd: info = -8
I'm not certain what the problem is but I can suggest something to try. I'll assume you really want around 20 eigenvalues. By...
11 years 前 | 0
Does hyperbolic-solver really use a nonlinear solver?!
Hi, Unfortunately, I believe you have uncovered a bug in the hyperbolic function that occurs when you have a nonlinear equati...
11 years 前 | 0
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Does hyperbolic-solver really use a nonlinear solver?!
Sorry about that! Apparently this GUI is too sophisticated for me ;-) I think I got it this time. Bill
11 years 前 | 0
Does hyperbolic-solver really use a nonlinear solver?!
Hi, I think that referring to gradient components in the form e.g. ux(1,:) is fine. But entering complicated nonlinear coeffi...
11 years 前 | 0
Does hyperbolic-solver really use a nonlinear solver?!
Oh, sorry, I thought you were using the documented hyperbolic function. I'm afraid I have no idea why your code isn't doing wha...
11 years 前 | 0
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